Battery pack

Abstract

A battery pack. The battery pack comprises a battery cover (1), a battery module (2), a battery frame (5) and a plastic support (3), wherein the plastic support (3) is assembled between the battery module (2) and the battery cover (1), the plastic support (3) is provided with a channel (31) recessed towards the battery module (2), a plurality of pressure relief through holes (311) corresponding to pressure relief openings of a battery cell on a one-to-one basis being formed in the channel (31), and the plastic support (3) is provided with a first groove (32), the first groove (32) being parallel to the channel (31) and being configured to assemble a bar plate; and at least one protective layer (7) is arranged between the plastic support (3) and the battery cover (1), the protective layer (7) covering the channel (31) and the first groove (32).

Description

A battery pack

[0001] The present application claims priority to the Chinese patent application No. 202421148657.8, filed on May 23, 2024, with the Chinese Patent Office, the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a battery pack. BACKGROUND

[0003] With the rapid development of the new energy vehicle industry, the innovation and optimization of battery technology have become the focus of the industry. Among them, the CTB (Cell to Body) battery technology has received widespread attention for its efficient integration and excellent performance.

[0004] In related technologies, in the design of CTB battery packs, the pressure relief ports of the battery cells usually face the cover of the battery pack. Although this design facilitates heat release and pressure regulation to some extent, it also brings new problems. Since the cover is usually designed to be lightweight, its pressure resistance is relatively weak. When the battery pack is subjected to external impact or internal pressure changes, the cover is prone to deformation. This deformation changes the pressure relief space between the pressure relief port and the cover, thereby affecting the normal pressure relief function of the battery pack, and even possibly leading to a decrease in the safety performance of the battery pack.

[0005] In addition, the deformation of the cover can also adversely affect other components within the battery pack. For example, the deformed cover can squeeze the battery cells or other components, leading to damage or performance degradation of the internal structure of the battery pack. This not only affects the service life of the battery pack, but also can pose a threat to the safety performance of the vehicle. SUMMARY

[0006] The present application can solve the problem of weak pressure resistance of the cover in existing battery packs, which is prone to deformation and changes the pressure relief space.

[0007] In a first aspect, the present application provides a battery pack. The battery pack comprises:

[0008] a battery cover;

[0009] a battery module comprising a plurality of stacked battery cells, the pressure relief ports of the battery cells facing the battery cover;

[0010] a battery frame, the battery module is assembled in the battery frame, and the battery cover plate is arranged on the battery frame; and

[0011] The plastic support is arranged between the battery module and the battery cover body. The plastic support is provided with a groove recessed towards the battery module. A plurality of pressure relief holes corresponding to the pressure relief ports of the battery cell are arranged in the groove. A first groove is arranged on the plastic support. The first groove is parallel to the groove. The first groove is configured to assemble the gasket.

[0012] The plastic support and the battery cover body are provided with at least one protective layer. The protective layer covers the groove and the first groove. Advantages

[0013] The battery pack provided by the application meets the lightweight design concept while considering the self-pressure resistance. The protective layer added between the plastic support and the battery cover body significantly improves the safety performance of the battery pack. The groove on the plastic support corresponds to the pressure relief port of the battery cell, ensuring that the pressure can be released smoothly when the internal pressure of the battery increases, preventing the battery from exploding. At the same time, by arranging the groove on the plastic support, the protective layer cooperates with the groove to prevent the battery cover body from deforming when subjected to external impact, thereby protecting the pressure relief port of the battery cell from being extruded, greatly improving the safety of the battery. By arranging the pressure relief holes in the groove, a pressure relief space is reserved for the battery cell. The protective layer can protect the pressure relief space, thereby improving the stability and safety of the battery pressure relief. BRIEF DESCRIPTION OF DRAWINGS

[0014] FIG. 1 is a partial exploded structural schematic diagram of some embodiments of the application;

[0015] FIG. 2 is a first fixed layer assembly structure schematic diagram of some embodiments of the application;

[0016] FIG. 3 is a second fixed layer assembly structure schematic diagram of some embodiments of the application;

[0017] FIG. 4 is a fourth protective layer assembly structure schematic diagram of some embodiments of the application;

[0018] FIG. 5 is a third protective layer assembly structure schematic diagram of some embodiments of the application;

[0019] FIG. 6 is a schematic diagram of the internal structure of the battery pack of some embodiments of the application;

[0020] FIG. 7 is a schematic diagram of the plastic support structure of some embodiments of the application.

[0021] Explanation of reference signs:

[0022] 1, battery cover body; 11, electrical compartment opening; 2, battery module; 21, cell group; 22, explosion-proof valve; 3, plastic support; 31, channel; 311, pressure relief hole; 312, first step structure; 32, first groove; 321, gasket assembly groove; 322, second step structure; 33, second groove; 34, second boss; 4, CCS assembly; 41, gasket; 42, sampling circuit; 43, sampling terminal; 5, battery frame; 51, battery compartment; 52, electrical compartment; 6, protective cover plate; 7, protective layer; 71, first fixed layer; 72, second fixed layer; 73, third protective layer; 74, fourth protective layer; 8, electrical compartment cover body; 81, support mechanism; 9, gasket protection plate. Embodiments of the present application

[0023] Embodiment 1 of the present application is shown in FIGS. 1-7, which discloses a battery pack including a battery cover body 1, a battery module 2, a plastic support 3, a CCS assembly 4 and a battery frame 5. The battery frame 5 includes a battery compartment 51 and an electrical compartment 52, which are adjacent and spaced apart, the battery module 2 is assembled in the battery frame 5, and the battery cover plate 1 is provided on the battery frame 5, the battery module 2 includes a cell group 21 stacked by a plurality of cells, and the pressure relief port of the cell faces the battery cover body 1; the battery module 2 is assembled in the battery frame 5, and the battery cover plate 1 is provided on the battery frame 5; the plastic support 3 is assembled between the battery module 2 and the battery cover body 1, the plastic support 3 is provided with a channel 31 recessed towards the battery module 2, a plurality of pressure relief holes 311 corresponding to the pressure relief ports of the cells are provided in the channel 31, and a first groove 32 is provided on the plastic support 3, the first groove 32 is parallel to the channel 31, and the first groove 32 is configured to assemble the gasket; wherein at least one protective layer 7 is provided between the plastic support 3 and the battery cover body 1, and the protective layer 7 is provided on the channel 31 and the first groove 32.

[0024] In the present application, first, by assembling a plastic support 3 between the battery module 2 and the battery cover body 1, and providing a channel 31 recessed towards the battery module 2 on the plastic support 3, these channels 31 correspond to the pressure relief holes 311 of the cells. Such design can ensure that when the internal pressure of the battery module 2 rises, the pressure relief port of the cell can smoothly release the pressure, and will not be disturbed by the deformation of the battery cover body 1. Secondly, at least one protective layer 7 is provided between the plastic support 3 and the battery cover body 1, which can prevent the battery cover body 1 from directly pressing the pressure relief port of the cell or the gasket in contact with the cell when subjected to external force impact, thereby enhancing the safety performance of the battery pack.

[0025] In some embodiments, the battery cell groups 21 are stacked, including but not limited to, along the length or width of the battery frame 5, or in a grid pattern. This embodiment does not impose any specific limitations. Each battery cell in the battery cell group 21 is equipped with an explosion-proof valve 22. The pressure relief port of the explosion-proof valve 22 faces the battery cover 1. A plastic bracket 3 is assembled between the battery module 2 and the battery cover 1. The plastic bracket 3 is provided with a groove 31 recessed towards the battery module 2. Multiple pressure relief through holes 311 corresponding to the pressure relief ports of the battery cells are opened in the groove 31. The number of grooves 31 is adapted to the number of battery cell groups 21. The number of pressure relief through holes 311 is sufficient to ensure that the pressure above the explosion-proof valve 22 of each battery cell can be relieved.

[0026] In some embodiments, each pressure relief hole 311 corresponds to two explosion-proof valves 22. A first groove 32 is provided on the plastic bracket 3, parallel to the channel 31, and configured to assemble the tab 41. At least one protective layer 7 is provided between the plastic bracket 3 and the battery cover 1, covering the channel 31 and the first groove 32. By assembling the plastic bracket 3 between the battery module 2 and the battery cover 1, and providing channels 31 recessed towards the battery module 2 on the plastic bracket 3, these channels 31 correspond to the pressure relief holes 311 of the battery cells. This design ensures that when the internal pressure of the battery module 2 increases, the pressure relief port of the battery cell can smoothly release pressure without being interfered with by the deformation of the cover. Furthermore, the provision of at least one protective layer 7 between the plastic bracket 3 and the battery cover 1 prevents the battery cover 1 from directly squeezing the pressure relief port of the battery cell or squeezing the tab 41 in contact with the battery cell when subjected to external impact, thereby enhancing the safety performance of the battery pack.

[0027] In one specific embodiment, the protective layer 7 includes a protective cover plate 6 and a protective plate 9. A first stepped structure 312 is provided on both sides of the inner wall of the channel 31, and the protective cover plate 6 is assembled to the first stepped structure 312. A second stepped structure 322 is provided on both sides of the inner wall of the first groove 32, and the protective plate 9 is assembled to the second stepped structure 322. The first stepped structure 312 and the second stepped structure 322 provide a stable assembly space for the protective cover plate 6 and the protective plate 9, thereby providing good protection for the battery pack and preventing the battery module 2 from deforming due to the pressure of the cover. It should be noted that the surfaces of the protective cover plate 6 facing the battery cover 1 and the protective plate 9 facing the battery cover 1 are aligned with the surfaces of the plastic bracket 3 facing the battery cover 1, which helps to improve the overall stability of the plastic bracket 3. In this embodiment, the protective cover plate 6 and the first stepped structure 312 are fixed by, but not limited to, adhesive bonding or snap-fitting, and the protective plate 9 and the second stepped structure 322 are fixed by, but not limited to, adhesive bonding or snap-fitting.

[0028] In a specific embodiment, the protective layer 7 comprises a third protective layer 73 covering the channel 31 and the first groove 32, and the third protective layer 73 is attached to the inner side wall of the battery cover body 1. The area of the third protective layer 73 is smaller than the area of the battery cover body 1, and the third protective layer 73 can completely cover the channel 31 and the first groove 32, so that the third protective layer 73 can cover the entire plastic support 3 and provide additional protection for the plastic support 3. Meanwhile, the third protective layer 73 also plays the role of insulation and heat insulation. The third protective layer 73 and the battery cover body 1 are fixed by, but not limited to, gluing or welding.

[0029] In a specific embodiment, the protective layer 7 comprises a fourth protective layer 74, and the number of the fourth protective layer 74 is equal to the sum of the number of the channel 31 and the number of the first groove 32. The fourth protective layer 74 is attached to the inner side wall of the battery cover body 1, and the area of each fourth protective layer 74 corresponds to the area of each channel 31 or the area of each first groove 32. By attaching the fourth protective layer 74 to the inner side wall of the battery cover body 1, the compression resistance and strength of the battery cover body 1 itself can be improved, and the risk of deformation of the battery cover body 1 itself can be reduced, thereby reducing the risk of extrusion of the internal structure of the channel 31 and the first groove 32. Meanwhile, the fourth protective layer 74 also plays the role of insulation and heat insulation. The fourth protective layer 74 and the battery cover body 1 are fixed by, but not limited to, gluing or welding.

[0030] In some embodiments, the protective layer further comprises a first fixing layer 71 arranged in a serpentine shape along the length direction of the battery cover body 1, which can absorb or disperse the impact force from the length direction and prevent the battery cover body 1 from deforming in this direction. In another embodiment, the protective layer 7 further comprises a second fixing layer 72 arranged in a serpentine shape along the width direction of the battery cover body 1, which can sequentially absorb or disperse the impact force from the width direction and prevent the battery cover body 1 from deforming in this direction. In yet another embodiment, the protective layer further comprises a first fixing layer 71 arranged in a serpentine shape along the length direction of the battery cover body 1, and the protective layer further comprises a first fixing layer 71 arranged in a serpentine shape along the length direction of the battery cover body 1. The first fixing layer 71 and the second fixing layer 72 cooperate with each other to sequentially absorb or disperse the impact force from the length direction and the width direction, and prevent the battery cover body 1 from deforming.

[0031] In some embodiments, in order to improve the stability of the battery cover body 1, a protective layer 7 is arranged between the protective cover plate 6 and the battery cover body 1. The protective layer 7 comprises a gasket protective plate 9, a third protective layer 73, a first fixing layer 71, and a second fixing layer 72. The first fixing layer 71 and the second fixing layer 72 are glue layers, which play the role of auxiliary fixing and supporting. The specific material of the protective layer in this embodiment is not limited, as long as it can achieve the protection effect. In other embodiments, the number of the protective layer is not specifically limited, and can be combined at will.

[0032] In some embodiments, the CCS assembly 4 includes a plurality of wafers 41, a collection line 42 and a sampling terminal 43. In addition to the channel 31, the plastic support 3 is provided with a first groove 32 corresponding to the electrode pole of the battery cell. The first groove 32 is parallel to the channel 31. A plurality of wafer assembly grooves 321 are arranged in the first groove 32. The wafer 41 is arranged in communication with the pole. When the wafer 41 is assembled into the first groove 32, the wafer 41 does not protrude above the first groove 32. Therefore, in some embodiments, in order to improve the stable working environment of the wafer 41, a second step structure 322 is arranged on both sides of the inner wall of the first groove 32, which is arranged to install the wafer protection plate 9. The plastic support 3 is provided with a second boss 34 protruding towards the battery cover 1 beside the first groove 32. In other words, the lower side of the second boss 34, i.e. the side facing the battery module, forms a second groove 33, which is arranged to accommodate the collection line 42. In order to enable the collection line 42 to collect information of the wafer 41, a plurality of passages are arranged between the first groove 32 and the second groove 33, which are arranged to enable the sampling terminal 43 to pass through, thereby facilitating the collection of wafer 41 information. It should be noted that each battery cell group 21 requires a corresponding channel 31 on the plastic support 3. The channel 31 is sequentially provided with a second boss 34 and a first groove 32 on both sides. When the channel 31 is covered with a protective cover plate 6 and the first groove 32 is covered with a wafer protection plate 9, the top surface of the second boss 34, the top surface of the protective cover plate 6 and the top surface of the wafer protection plate 9 form a plane, thereby ensuring that the plastic support 3 can be perfectly stressed.

[0033] On the basis that the top surface of the second boss 34, the top surface of the protective cover plate 6 and the top surface of the wafer protection plate 9 form a plane, the second fixing layer 72 is arranged in the same direction as the protective cover plate 6 and the wafer protection plate 9, thereby providing an auxiliary fixing function. The first fixing layer 71 is arranged perpendicularly to the protective cover plate 6 and the wafer protection plate 9. The trajectory of the first fixing layer 71 can cover the positions where the protective cover plate 6, the wafer protection plate 9 and the plastic support 3 are in contact, thereby improving the stable support effect provided by the plastic support 3. When the battery cell group 21 is arranged in multiple rows, the adjacent wafer protection plates 9 can be integrally arranged, thereby improving the assembly stability.

[0034] In some embodiments, the protective cover plate 6 is made of a high-temperature-resistant and impact-resistant material, which is arranged to resist the thermal runaway of the battery cell. The wafer protection plate 9 is mainly arranged to protect the electrical connection assembly, and a material with insulation and certain pressure resistance can be used.

[0035] In some embodiments, an electrical compartment cover 8 is further included, which can be locked with the battery cover 1 and the battery frame 5 by screws. In this embodiment 1, the battery cover 1 is preformed with an electrical compartment opening 11 at the electrical compartment 52, and the electrical compartment cover 8 is locked above the electrical compartment opening 11, so that the electrical compartment cover 8 is arranged on the battery cover 1. In this embodiment, in order to improve the load-bearing capacity of the electrical compartment cover 8, a supporting mechanism 81 can be arranged in the electrical compartment 52, which can provide additional support force for the electrical compartment cover 8, and the supporting mechanism 81 is a hollow supporting block. It should be noted that in order to improve the sealing performance of the lock, a sealing member needs to be arranged at the lock.

[0036] In summary, the battery pack provided by the present application has the following technical effects:

[0037] 1. By adding a protective layer 7 between the plastic support 3 and the battery cover 1, the safety performance of the battery pack is significantly improved. The groove 31 on the plastic support 3 corresponds to the pressure relief port of the battery cell, which ensures that the pressure can be released smoothly when the internal pressure of the battery increases, preventing the battery from exploding;

[0038] 2. By arranging the groove 31 on the plastic support 3, the protective layer 7 cooperates with the groove 31 to prevent the battery cover 1 from deforming when subjected to external impact, thereby protecting the pressure relief port of the battery cell from being squeezed, greatly improving the safety of the battery;

[0039] 3. By arranging the pressure relief hole 311 in the groove 31, a pressure relief space is reserved for the battery cell, and the protective layer 7 can also protect the pressure relief space, thereby improving the stability and safety of the battery pressure relief;

[0040] 4. This design meets the lightweight design concept while taking into account its own pressure resistance.

Claims

1. A battery pack, comprising: a battery cover (1) ; a battery module (2) comprising a plurality of stacked battery cells, the pressure relief ports of the battery cells facing the battery cover (1) ; a battery frame (5), the battery module (2) being assembled in the battery frame (5), the battery cover (1) being provided on the battery frame (5) ; a plastic support (3) being assembled between the battery module (2) and the battery cover (1), the plastic support (3) being provided with a groove (31) recessed towards the battery module (2), a plurality of pressure relief through holes (311) corresponding to the pressure relief ports of the battery cells being provided in the groove (31), the plastic support (3) being provided with a first groove (32) parallel to the groove (31), the first groove (32) being configured to assemble a gasket; at least one protective layer (7) being provided between the plastic support (3) and the battery cover (1), the protective layer (7) being provided on the groove (31) and the first groove (32).

2. The battery pack of claim 1, wherein, The protective layer (7) comprises a protective cover plate (6) and a gasket protective plate (9), both sides of the inner wall of the groove (31) are provided with a first stepped structure (312), the protective cover plate (6) is assembled on the first stepped structure (312), both sides of the inner wall of the first groove (32) are provided with a second stepped structure (322), the gasket protective plate (9) is assembled on the second stepped structure (322).

3. The battery pack of claim 2, wherein, The surface of the protective cover plate (6) facing the battery cover (1) and the surface of the gasket protective plate (9) facing the battery cover (1) are aligned with the surface of the plastic support (3) facing the battery cover (1).

4. The battery pack of claim 3, wherein, The protective plate (6) and the first stepped structure (312) are fixed by gluing or clamping; and / or, The gasket protective plate (9) and the second stepped structure (322) are fixed by gluing or clamping.

5. The battery pack of claim 1, wherein, The protective layer (7) comprises a third protective layer (73) covering the groove (31) and the first groove (32), the third protective layer (73) being attached to the inner side wall of the battery cover (1).

6. The battery pack of claim 5, wherein, The third protective layer (73) and the battery cover plate (1) are fixed by gluing or welding.

7. The battery pack of claim 1, wherein, The protective layer (7) comprises a fourth protective layer (74), the number of the fourth protective layer (74) being equal to the sum of the number of the groove (31) and the number of the first groove (32), the fourth protective layer (74) being attached to the inner side wall of the battery cover (1), the area of each fourth protective layer (74) corresponding to the area of each groove (31) or the area of the first groove (32).

8. The battery pack of claim 7, wherein, The fourth protective layer (74) and the battery cover plate (1) are fixed by gluing or welding.

9. The battery pack of any one of claims 1-8, wherein, The protective layer (7) further comprises a first fixed layer (71) arranged in a serpentine shape along the length direction of the battery cover body (1), and / or the protective layer (7) further comprises a second fixed layer (72) arranged in a serpentine shape along the width direction of the battery cover body (1).

10. The battery pack of any one of claims 1-8, wherein, The protective layer (7) comprises a first fixed layer (71) and a second fixed layer (72), the first fixed layer (71) comprises a first glue layer, and the second fixed layer (72) comprises a second glue layer.

11. The battery pack of claim 2, wherein, The side of the plastic support (3) facing the battery module (2) is further provided with a second groove (33), and the second groove (33) is provided with a collection circuit (42).

12. The battery pack of claim 11, wherein, The second groove (33) protrudes to form a second boss (34) on the side of the plastic support (3) close to the battery cover body (1), and the face of the second boss (34) facing the battery cover body (1) is aligned with the face of the protective cover plate (6) facing the battery cover body (1).

13. The battery pack of any one of claims 1-8, wherein, The battery core is further provided with an explosion-proof valve (22), and each pressure relief through hole (311) corresponds to two explosion-proof valves (22).

14. The battery pack of any one of claims 1-8, wherein, The battery frame (5) comprises a battery compartment (51) and an electrical compartment (52), the battery compartment (51) and the electrical compartment (52) are arranged adjacent and spaced apart, the battery cover body (1) is covered above the battery compartment (51), the battery cover body (1) is provided with an electrical compartment opening (11) corresponding to the electrical compartment (52), the electrical compartment opening (11) is covered with an electrical compartment cover body (8), and a supporting mechanism (81) is arranged between the electrical compartment cover body (8) and the electrical compartment (52).

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